Free solar and battery tools
Five free tools that work out the answer for your own home. Each one sits inside the guide that explains the method and sources, and nothing you type is sent to us.
Thinking about solar
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Solar panel calculator
How many panels match your electricity use, how many fit on your roof, and a rough cost, saving and payback.
In the guide: How many solar panels do I need?
Open the solar panel calculator -
Planning permission checker
Whether panels on your home are likely to be permitted development, in England, Wales, Scotland or Northern Ireland.
In the guide: Do you need planning permission for solar panels?
Open the planning permission checker
Got a quote
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Solar quote checker
Up to three quotes: price per kWp against the government average, the battery line, deposit and VAT, with questions to send back.
In the guide: How to check a solar panel quote before you sign
Open the solar quote checker
Batteries
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Battery planner
Whether a home battery is likely to pay for itself for your home, compared with switching tariff first.
Open the battery planner -
Battery backup checker
Whether a battery could run the appliances you choose in a power cut, and for roughly how long.
In the guide: Does a solar battery work in a power cut?
Open the battery backup checker
The tools give a first answer from public figures and the information you enter. An installer's survey and quote decide the real thing. How we check our figures.